| 摘要 |
The frame has a foot (1) that pivots on an axle (7) in adjacent vertical (2) and horizontal (3) sides. The foot that is not in use is held in a hollow (8) in the frame whose depth is equal to the thickness of the foot. A notch (4) exerts pressure on the foot to make it pivot outwards. The foot holds the frame in an inclined position either in a vertical or horizontal direction. The width of the hollow varies according to the width of the frame and the length of the foot can vary.
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